1. Brindley, G. W. (Editor), X-ray identification and structure of clay minerals (London 1951).
2. Garcia Vicente J., Estructura cristalina de la areilla (Madrid 1951).
3. Jasmund, K., Die silikatischen Tonminerale (Weinheim 1951).
4. MacEwan, D. M. C., J. Soil Sci.1, 90 (1949).
5. Salt, F. E., Clay Mins. Bull.1, 55 (1947) (discussion).